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Finding the Fourth Proportional to 102,915.40, 154,154.40 and 85,419.40

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Solution

The fourth proportional to 102,915.40, 154,154.40 and 85,419.40 is: 127,947.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,915.40 : 154,154.40 = 85,419.40 : x
  2. Step 2: Convert to fraction form
    102,915.40/154,154.40 = 85,419.40/x
  3. Step 3: Cross multiply
    102,915.40x = 154,154.40 × 85,419.40
  4. Step 4: Simplify right side
    102,915.40x = 13,167,776,355.36
  5. Step 5: Solve for x
    x = 13,167,776,355.36/102,915.40
  6. Step 6: Final answer
    x = 127,947.58

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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.