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Finding the Fourth Proportional to 385,279.31, 531,656.55 and 215,480.63

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Solution

The fourth proportional to 385,279.31, 531,656.55 and 215,480.63 is: 297,347.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,279.31 : 531,656.55 = 215,480.63 : x
  2. Step 2: Convert to fraction form
    385,279.31/531,656.55 = 215,480.63/x
  3. Step 3: Cross multiply
    385,279.31x = 531,656.55 × 215,480.63
  4. Step 4: Simplify right side
    385,279.31x = 114,561,685,679.34
  5. Step 5: Solve for x
    x = 114,561,685,679.34/385,279.31
  6. Step 6: Final answer
    x = 297,347.10

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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.