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Finding the Fourth Proportional to 385,307.55, 531,703.04 and 215,508.87

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Solution

The fourth proportional to 385,307.55, 531,703.04 and 215,508.87 is: 297,390.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,307.55 : 531,703.04 = 215,508.87 : x
  2. Step 2: Convert to fraction form
    385,307.55/531,703.04 = 215,508.87/x
  3. Step 3: Cross multiply
    385,307.55x = 531,703.04 × 215,508.87
  4. Step 4: Simplify right side
    385,307.55x = 114,586,720,248.42
  5. Step 5: Solve for x
    x = 114,586,720,248.42/385,307.55
  6. Step 6: Final answer
    x = 297,390.28

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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.