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Finding the Fourth Proportional to 102,612.60, 153,568.80 and 85,991.40

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Solution

The fourth proportional to 102,612.60, 153,568.80 and 85,991.40 is: 128,693.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,612.60 : 153,568.80 = 85,991.40 : x
  2. Step 2: Convert to fraction form
    102,612.60/153,568.80 = 85,991.40/x
  3. Step 3: Cross multiply
    102,612.60x = 153,568.80 × 85,991.40
  4. Step 4: Simplify right side
    102,612.60x = 13,205,596,108.32
  5. Step 5: Solve for x
    x = 13,205,596,108.32/102,612.60
  6. Step 6: Final answer
    x = 128,693.71

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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.