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Finding the Fourth Proportional to 402,980.40, 604,470.60 and 385,265.70

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Solution

The fourth proportional to 402,980.40, 604,470.60 and 385,265.70 is: 577,898.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,980.40 : 604,470.60 = 385,265.70 : x
  2. Step 2: Convert to fraction form
    402,980.40/604,470.60 = 385,265.70/x
  3. Step 3: Cross multiply
    402,980.40x = 604,470.60 × 385,265.70
  4. Step 4: Simplify right side
    402,980.40x = 232,881,788,838.42
  5. Step 5: Solve for x
    x = 232,881,788,838.42/402,980.40
  6. Step 6: Final answer
    x = 577,898.55

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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.