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Finding the Fourth Proportional to 904.91, 1,248.80 and 511.91

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Solution

The fourth proportional to 904.91, 1,248.80 and 511.91 is: 706.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.91 : 1,248.80 = 511.91 : x
  2. Step 2: Convert to fraction form
    904.91/1,248.80 = 511.91/x
  3. Step 3: Cross multiply
    904.91x = 1,248.80 × 511.91
  4. Step 4: Simplify right side
    904.91x = 639,268.24
  5. Step 5: Solve for x
    x = 639,268.24/904.91
  6. Step 6: Final answer
    x = 706.45

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Double scale
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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.