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Finding the Fourth Proportional to 639,478.80, 959,218.20 and 612,176.40

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Solution

The fourth proportional to 639,478.80, 959,218.20 and 612,176.40 is: 918,264.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,478.80 : 959,218.20 = 612,176.40 : x
  2. Step 2: Convert to fraction form
    639,478.80/959,218.20 = 612,176.40/x
  3. Step 3: Cross multiply
    639,478.80x = 959,218.20 × 612,176.40
  4. Step 4: Simplify right side
    639,478.80x = 587,210,744,490.48
  5. Step 5: Solve for x
    x = 587,210,744,490.48/639,478.80
  6. Step 6: Final answer
    x = 918,264.60

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Double scale
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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.