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Finding the Fourth Proportional to 18,931.98, 26,126.24 and 10,978.93

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Solution

The fourth proportional to 18,931.98, 26,126.24 and 10,978.93 is: 15,150.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.98 : 26,126.24 = 10,978.93 : x
  2. Step 2: Convert to fraction form
    18,931.98/26,126.24 = 10,978.93/x
  3. Step 3: Cross multiply
    18,931.98x = 26,126.24 × 10,978.93
  4. Step 4: Simplify right side
    18,931.98x = 286,838,160.12
  5. Step 5: Solve for x
    x = 286,838,160.12/18,931.98
  6. Step 6: Final answer
    x = 15,150.99

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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.