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Finding the Fourth Proportional to 85,688.60, 128,532.90 and 76,503.20

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Solution

The fourth proportional to 85,688.60, 128,532.90 and 76,503.20 is: 114,754.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,688.60 : 128,532.90 = 76,503.20 : x
  2. Step 2: Convert to fraction form
    85,688.60/128,532.90 = 76,503.20/x
  3. Step 3: Cross multiply
    85,688.60x = 128,532.90 × 76,503.20
  4. Step 4: Simplify right side
    85,688.60x = 9,833,178,155.28
  5. Step 5: Solve for x
    x = 9,833,178,155.28/85,688.60
  6. Step 6: Final answer
    x = 114,754.80

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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.