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Finding the Fourth Proportional to 86,699.80, 129,903.90 and 57,102.40

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Solution

The fourth proportional to 86,699.80, 129,903.90 and 57,102.40 is: 85,557.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,699.80 : 129,903.90 = 57,102.40 : x
  2. Step 2: Convert to fraction form
    86,699.80/129,903.90 = 57,102.40/x
  3. Step 3: Cross multiply
    86,699.80x = 129,903.90 × 57,102.40
  4. Step 4: Simplify right side
    86,699.80x = 7,417,824,459.36
  5. Step 5: Solve for x
    x = 7,417,824,459.36/86,699.80
  6. Step 6: Final answer
    x = 85,557.57

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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.