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Finding the Fourth Proportional to 103,687.90, 155,531.85 and 70,510.30

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Solution

The fourth proportional to 103,687.90, 155,531.85 and 70,510.30 is: 105,765.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,687.90 : 155,531.85 = 70,510.30 : x
  2. Step 2: Convert to fraction form
    103,687.90/155,531.85 = 70,510.30/x
  3. Step 3: Cross multiply
    103,687.90x = 155,531.85 × 70,510.30
  4. Step 4: Simplify right side
    103,687.90x = 10,966,597,403.06
  5. Step 5: Solve for x
    x = 10,966,597,403.06/103,687.90
  6. Step 6: Final answer
    x = 105,765.45

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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.