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Finding the Fourth Proportional to 898.97, 1,240.80 and 637.07

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Solution

The fourth proportional to 898.97, 1,240.80 and 637.07 is: 879.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.97 : 1,240.80 = 637.07 : x
  2. Step 2: Convert to fraction form
    898.97/1,240.80 = 637.07/x
  3. Step 3: Cross multiply
    898.97x = 1,240.80 × 637.07
  4. Step 4: Simplify right side
    898.97x = 790,476.46
  5. Step 5: Solve for x
    x = 790,476.46/898.97
  6. Step 6: Final answer
    x = 879.31

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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.