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Finding the Fourth Proportional to 172,001.40, 258,002.10 and 78,689.40

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Solution

The fourth proportional to 172,001.40, 258,002.10 and 78,689.40 is: 118,034.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,001.40 : 258,002.10 = 78,689.40 : x
  2. Step 2: Convert to fraction form
    172,001.40/258,002.10 = 78,689.40/x
  3. Step 3: Cross multiply
    172,001.40x = 258,002.10 × 78,689.40
  4. Step 4: Simplify right side
    172,001.40x = 20,302,030,447.74
  5. Step 5: Solve for x
    x = 20,302,030,447.74/172,001.40
  6. Step 6: Final answer
    x = 118,034.10

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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.