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Finding the Fourth Proportional to 102,021.40, 153,032.10 and 85,691.80

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Solution

The fourth proportional to 102,021.40, 153,032.10 and 85,691.80 is: 128,537.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,021.40 : 153,032.10 = 85,691.80 : x
  2. Step 2: Convert to fraction form
    102,021.40/153,032.10 = 85,691.80/x
  3. Step 3: Cross multiply
    102,021.40x = 153,032.10 × 85,691.80
  4. Step 4: Simplify right side
    102,021.40x = 13,113,596,106.78
  5. Step 5: Solve for x
    x = 13,113,596,106.78/102,021.40
  6. Step 6: Final answer
    x = 128,537.70

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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.