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Finding the Fourth Proportional to 78,931.60, 117,821.60 and 68,966.98

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Solution

The fourth proportional to 78,931.60, 117,821.60 and 68,966.98 is: 102,947.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,931.60 : 117,821.60 = 68,966.98 : x
  2. Step 2: Convert to fraction form
    78,931.60/117,821.60 = 68,966.98/x
  3. Step 3: Cross multiply
    78,931.60x = 117,821.60 × 68,966.98
  4. Step 4: Simplify right side
    78,931.60x = 8,125,799,937.94
  5. Step 5: Solve for x
    x = 8,125,799,937.94/78,931.60
  6. Step 6: Final answer
    x = 102,947.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.