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Finding the Fourth Proportional to 60,721.32, 91,064.22 and 21,271.08

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Solution

The fourth proportional to 60,721.32, 91,064.22 and 21,271.08 is: 31,900.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,721.32 : 91,064.22 = 21,271.08 : x
  2. Step 2: Convert to fraction form
    60,721.32/91,064.22 = 21,271.08/x
  3. Step 3: Cross multiply
    60,721.32x = 91,064.22 × 21,271.08
  4. Step 4: Simplify right side
    60,721.32x = 1,937,034,308.76
  5. Step 5: Solve for x
    x = 1,937,034,308.76/60,721.32
  6. Step 6: Final answer
    x = 31,900.40

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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.