Home / 785,425.80-1,178,138.70-386,128.20

Finding the Fourth Proportional to 785,425.80, 1,178,138.70 and 386,128.20

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Solution

The fourth proportional to 785,425.80, 1,178,138.70 and 386,128.20 is: 579,192.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    785,425.80 : 1,178,138.70 = 386,128.20 : x
  2. Step 2: Convert to fraction form
    785,425.80/1,178,138.70 = 386,128.20/x
  3. Step 3: Cross multiply
    785,425.80x = 1,178,138.70 × 386,128.20
  4. Step 4: Simplify right side
    785,425.80x = 454,912,575,581.34
  5. Step 5: Solve for x
    x = 454,912,575,581.34/785,425.80
  6. Step 6: Final answer
    x = 579,192.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.