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Finding the Fourth Proportional to 21,294.40, 29,386.56 and 12,342.40

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Solution

The fourth proportional to 21,294.40, 29,386.56 and 12,342.40 is: 17,032.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,294.40 : 29,386.56 = 12,342.40 : x
  2. Step 2: Convert to fraction form
    21,294.40/29,386.56 = 12,342.40/x
  3. Step 3: Cross multiply
    21,294.40x = 29,386.56 × 12,342.40
  4. Step 4: Simplify right side
    21,294.40x = 362,700,678.14
  5. Step 5: Solve for x
    x = 362,700,678.14/21,294.40
  6. Step 6: Final answer
    x = 17,032.68

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1.5x scale

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.