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Finding the Fourth Proportional to 86,887.40, 130,112.40 and 57,144.20

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Solution

The fourth proportional to 86,887.40, 130,112.40 and 57,144.20 is: 85,572.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,887.40 : 130,112.40 = 57,144.20 : x
  2. Step 2: Convert to fraction form
    86,887.40/130,112.40 = 57,144.20/x
  3. Step 3: Cross multiply
    86,887.40x = 130,112.40 × 57,144.20
  4. Step 4: Simplify right side
    86,887.40x = 7,435,169,008.08
  5. Step 5: Solve for x
    x = 7,435,169,008.08/86,887.40
  6. Step 6: Final answer
    x = 85,572.47

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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.