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Finding the Fourth Proportional to 74,712.60, 112,068.90 and 70,921.80

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Solution

The fourth proportional to 74,712.60, 112,068.90 and 70,921.80 is: 106,382.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,712.60 : 112,068.90 = 70,921.80 : x
  2. Step 2: Convert to fraction form
    74,712.60/112,068.90 = 70,921.80/x
  3. Step 3: Cross multiply
    74,712.60x = 112,068.90 × 70,921.80
  4. Step 4: Simplify right side
    74,712.60x = 7,948,128,112.02
  5. Step 5: Solve for x
    x = 7,948,128,112.02/74,712.60
  6. Step 6: Final answer
    x = 106,382.70

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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.