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Finding the Fourth Proportional to 942.90, 1,411.47 and 921.30

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Solution

The fourth proportional to 942.90, 1,411.47 and 921.30 is: 1,379.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.90 : 1,411.47 = 921.30 : x
  2. Step 2: Convert to fraction form
    942.90/1,411.47 = 921.30/x
  3. Step 3: Cross multiply
    942.90x = 1,411.47 × 921.30
  4. Step 4: Simplify right side
    942.90x = 1,300,387.31
  5. Step 5: Solve for x
    x = 1,300,387.31/942.90
  6. Step 6: Final answer
    x = 1,379.14

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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.