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Finding the Fourth Proportional to 904.61, 1,247.91 and 572.92

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Solution

The fourth proportional to 904.61, 1,247.91 and 572.92 is: 790.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.61 : 1,247.91 = 572.92 : x
  2. Step 2: Convert to fraction form
    904.61/1,247.91 = 572.92/x
  3. Step 3: Cross multiply
    904.61x = 1,247.91 × 572.92
  4. Step 4: Simplify right side
    904.61x = 714,946.36
  5. Step 5: Solve for x
    x = 714,946.36/904.61
  6. Step 6: Final answer
    x = 790.34

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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.