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Finding the Fourth Proportional to 639,490.60, 960,920.70 and 355,407.40

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Solution

The fourth proportional to 639,490.60, 960,920.70 and 355,407.40 is: 534,047.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,490.60 : 960,920.70 = 355,407.40 : x
  2. Step 2: Convert to fraction form
    639,490.60/960,920.70 = 355,407.40/x
  3. Step 3: Cross multiply
    639,490.60x = 960,920.70 × 355,407.40
  4. Step 4: Simplify right side
    639,490.60x = 341,518,327,593.18
  5. Step 5: Solve for x
    x = 341,518,327,593.18/639,490.60
  6. Step 6: Final answer
    x = 534,047.46

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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.