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Finding the Fourth Proportional to 85,886.20, 128,838.90 and 26,721.40

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Solution

The fourth proportional to 85,886.20, 128,838.90 and 26,721.40 is: 40,085.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,886.20 : 128,838.90 = 26,721.40 : x
  2. Step 2: Convert to fraction form
    85,886.20/128,838.90 = 26,721.40/x
  3. Step 3: Cross multiply
    85,886.20x = 128,838.90 × 26,721.40
  4. Step 4: Simplify right side
    85,886.20x = 3,442,755,782.46
  5. Step 5: Solve for x
    x = 3,442,755,782.46/85,886.20
  6. Step 6: Final answer
    x = 40,085.09

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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.