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Finding the Fourth Proportional to 661.15, 912.35 and 503.88

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Solution

The fourth proportional to 661.15, 912.35 and 503.88 is: 695.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.15 : 912.35 = 503.88 : x
  2. Step 2: Convert to fraction form
    661.15/912.35 = 503.88/x
  3. Step 3: Cross multiply
    661.15x = 912.35 × 503.88
  4. Step 4: Simplify right side
    661.15x = 459,718.46
  5. Step 5: Solve for x
    x = 459,718.46/661.15
  6. Step 6: Final answer
    x = 695.33

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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.