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Finding the Fourth Proportional to 106,322.40, 159,337.80 and 86,639.40

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Solution

The fourth proportional to 106,322.40, 159,337.80 and 86,639.40 is: 129,840.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    106,322.40 : 159,337.80 = 86,639.40 : x
  2. Step 2: Convert to fraction form
    106,322.40/159,337.80 = 86,639.40/x
  3. Step 3: Cross multiply
    106,322.40x = 159,337.80 × 86,639.40
  4. Step 4: Simplify right side
    106,322.40x = 13,804,931,389.32
  5. Step 5: Solve for x
    x = 13,804,931,389.32/106,322.40
  6. Step 6: Final answer
    x = 129,840.29

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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.