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Finding the Fourth Proportional to 103,951.40, 155,708.40 and 86,455.40

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Solution

The fourth proportional to 103,951.40, 155,708.40 and 86,455.40 is: 129,501.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,951.40 : 155,708.40 = 86,455.40 : x
  2. Step 2: Convert to fraction form
    103,951.40/155,708.40 = 86,455.40/x
  3. Step 3: Cross multiply
    103,951.40x = 155,708.40 × 86,455.40
  4. Step 4: Simplify right side
    103,951.40x = 13,461,832,005.36
  5. Step 5: Solve for x
    x = 13,461,832,005.36/103,951.40
  6. Step 6: Final answer
    x = 129,501.21

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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.