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Finding the Fourth Proportional to 916.04, 1,264.20 and 637.40

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Solution

The fourth proportional to 916.04, 1,264.20 and 637.40 is: 879.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.04 : 1,264.20 = 637.40 : x
  2. Step 2: Convert to fraction form
    916.04/1,264.20 = 637.40/x
  3. Step 3: Cross multiply
    916.04x = 1,264.20 × 637.40
  4. Step 4: Simplify right side
    916.04x = 805,801.08
  5. Step 5: Solve for x
    x = 805,801.08/916.04
  6. Step 6: Final answer
    x = 879.66

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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.