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Finding the Fourth Proportional to 387,434.88, 534,656.67 and 215,348.46

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Solution

The fourth proportional to 387,434.88, 534,656.67 and 215,348.46 is: 297,178.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,434.88 : 534,656.67 = 215,348.46 : x
  2. Step 2: Convert to fraction form
    387,434.88/534,656.67 = 215,348.46/x
  3. Step 3: Cross multiply
    387,434.88x = 534,656.67 × 215,348.46
  4. Step 4: Simplify right side
    387,434.88x = 115,137,490,513.23
  5. Step 5: Solve for x
    x = 115,137,490,513.23/387,434.88
  6. Step 6: Final answer
    x = 297,178.95

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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.