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Finding the Fourth Proportional to 86,885.40, 130,109.40 and 57,142.20

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Solution

The fourth proportional to 86,885.40, 130,109.40 and 57,142.20 is: 85,569.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,885.40 : 130,109.40 = 57,142.20 : x
  2. Step 2: Convert to fraction form
    86,885.40/130,109.40 = 57,142.20/x
  3. Step 3: Cross multiply
    86,885.40x = 130,109.40 × 57,142.20
  4. Step 4: Simplify right side
    86,885.40x = 7,434,737,356.68
  5. Step 5: Solve for x
    x = 7,434,737,356.68/86,885.40
  6. Step 6: Final answer
    x = 85,569.47

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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.