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Finding the Fourth Proportional to 904.85, 1,248.68 and 511.86

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Solution

The fourth proportional to 904.85, 1,248.68 and 511.86 is: 706.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.85 : 1,248.68 = 511.86 : x
  2. Step 2: Convert to fraction form
    904.85/1,248.68 = 511.86/x
  3. Step 3: Cross multiply
    904.85x = 1,248.68 × 511.86
  4. Step 4: Simplify right side
    904.85x = 639,149.34
  5. Step 5: Solve for x
    x = 639,149.34/904.85
  6. Step 6: Final answer
    x = 706.36

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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.