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Finding the Fourth Proportional to 387,689.82, 535,014.90 and 215,610.18

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Solution

The fourth proportional to 387,689.82, 535,014.90 and 215,610.18 is: 297,543.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,689.82 : 535,014.90 = 215,610.18 : x
  2. Step 2: Convert to fraction form
    387,689.82/535,014.90 = 215,610.18/x
  3. Step 3: Cross multiply
    387,689.82x = 535,014.90 × 215,610.18
  4. Step 4: Simplify right side
    387,689.82x = 115,354,658,891.68
  5. Step 5: Solve for x
    x = 115,354,658,891.68/387,689.82
  6. Step 6: Final answer
    x = 297,543.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.