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Finding the Fourth Proportional to 641,487.61, 885,280.69 and 355,007.80

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Solution

The fourth proportional to 641,487.61, 885,280.69 and 355,007.80 is: 489,926.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,487.61 : 885,280.69 = 355,007.80 : x
  2. Step 2: Convert to fraction form
    641,487.61/885,280.69 = 355,007.80/x
  3. Step 3: Cross multiply
    641,487.61x = 885,280.69 × 355,007.80
  4. Step 4: Simplify right side
    641,487.61x = 314,281,550,139.38
  5. Step 5: Solve for x
    x = 314,281,550,139.38/641,487.61
  6. Step 6: Final answer
    x = 489,926.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.