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Finding the Fourth Proportional to 611,865.40, 917,798.10 and 521,323.60

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Solution

The fourth proportional to 611,865.40, 917,798.10 and 521,323.60 is: 781,985.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,865.40 : 917,798.10 = 521,323.60 : x
  2. Step 2: Convert to fraction form
    611,865.40/917,798.10 = 521,323.60/x
  3. Step 3: Cross multiply
    611,865.40x = 917,798.10 × 521,323.60
  4. Step 4: Simplify right side
    611,865.40x = 478,469,809,565.16
  5. Step 5: Solve for x
    x = 478,469,809,565.16/611,865.40
  6. Step 6: Final answer
    x = 781,985.40

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Similar ratio
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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.