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Finding the Fourth Proportional to 898.66, 1,240.02 and 505.66

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Solution

The fourth proportional to 898.66, 1,240.02 and 505.66 is: 697.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.66 : 1,240.02 = 505.66 : x
  2. Step 2: Convert to fraction form
    898.66/1,240.02 = 505.66/x
  3. Step 3: Cross multiply
    898.66x = 1,240.02 × 505.66
  4. Step 4: Simplify right side
    898.66x = 627,028.51
  5. Step 5: Solve for x
    x = 627,028.51/898.66
  6. Step 6: Final answer
    x = 697.74

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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.