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Finding the Fourth Proportional to 781,805.78, 1,078,894.05 and 424,109.78

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Solution

The fourth proportional to 781,805.78, 1,078,894.05 and 424,109.78 is: 585,272.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    781,805.78 : 1,078,894.05 = 424,109.78 : x
  2. Step 2: Convert to fraction form
    781,805.78/1,078,894.05 = 424,109.78/x
  3. Step 3: Cross multiply
    781,805.78x = 1,078,894.05 × 424,109.78
  4. Step 4: Simplify right side
    781,805.78x = 457,569,518,188.81
  5. Step 5: Solve for x
    x = 457,569,518,188.81/781,805.78
  6. Step 6: Final answer
    x = 585,272.62

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Double scale
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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.