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Finding the Fourth Proportional to 102,000.45, 153,000.68 and 78,672.45

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Solution

The fourth proportional to 102,000.45, 153,000.68 and 78,672.45 is: 118,008.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,000.45 : 153,000.68 = 78,672.45 : x
  2. Step 2: Convert to fraction form
    102,000.45/153,000.68 = 78,672.45/x
  3. Step 3: Cross multiply
    102,000.45x = 153,000.68 × 78,672.45
  4. Step 4: Simplify right side
    102,000.45x = 12,036,937,953.90
  5. Step 5: Solve for x
    x = 12,036,937,953.90/102,000.45
  6. Step 6: Final answer
    x = 118,008.68

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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.