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Finding the Fourth Proportional to 578,053.80, 867,080.70 and 438,085.80

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Solution

The fourth proportional to 578,053.80, 867,080.70 and 438,085.80 is: 657,128.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,053.80 : 867,080.70 = 438,085.80 : x
  2. Step 2: Convert to fraction form
    578,053.80/867,080.70 = 438,085.80/x
  3. Step 3: Cross multiply
    578,053.80x = 867,080.70 × 438,085.80
  4. Step 4: Simplify right side
    578,053.80x = 379,855,742,124.06
  5. Step 5: Solve for x
    x = 379,855,742,124.06/578,053.80
  6. Step 6: Final answer
    x = 657,128.70

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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.