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Finding the Fourth Proportional to 931.16, 1,393.20 and 623.72

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Solution

The fourth proportional to 931.16, 1,393.20 and 623.72 is: 933.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.16 : 1,393.20 = 623.72 : x
  2. Step 2: Convert to fraction form
    931.16/1,393.20 = 623.72/x
  3. Step 3: Cross multiply
    931.16x = 1,393.20 × 623.72
  4. Step 4: Simplify right side
    931.16x = 868,966.70
  5. Step 5: Solve for x
    x = 868,966.70/931.16
  6. Step 6: Final answer
    x = 933.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.