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Finding the Fourth Proportional to 86,650.16, 129,919.20 and 56,978.12

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Solution

The fourth proportional to 86,650.16, 129,919.20 and 56,978.12 is: 85,430.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,650.16 : 129,919.20 = 56,978.12 : x
  2. Step 2: Convert to fraction form
    86,650.16/129,919.20 = 56,978.12/x
  3. Step 3: Cross multiply
    86,650.16x = 129,919.20 × 56,978.12
  4. Step 4: Simplify right side
    86,650.16x = 7,402,551,767.90
  5. Step 5: Solve for x
    x = 7,402,551,767.90/86,650.16
  6. Step 6: Final answer
    x = 85,430.33

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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.