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Finding the Fourth Proportional to 115,419.70, 159,178.79 and 81,368.10

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Solution

The fourth proportional to 115,419.70, 159,178.79 and 81,368.10 is: 112,217.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,419.70 : 159,178.79 = 81,368.10 : x
  2. Step 2: Convert to fraction form
    115,419.70/159,178.79 = 81,368.10/x
  3. Step 3: Cross multiply
    115,419.70x = 159,178.79 × 81,368.10
  4. Step 4: Simplify right side
    115,419.70x = 12,952,075,702.60
  5. Step 5: Solve for x
    x = 12,952,075,702.60/115,419.70
  6. Step 6: Final answer
    x = 112,217.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.