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Finding the Fourth Proportional to 92,978.21, 128,307.23 and 52,695.69

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Solution

The fourth proportional to 92,978.21, 128,307.23 and 52,695.69 is: 72,718.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,978.21 : 128,307.23 = 52,695.69 : x
  2. Step 2: Convert to fraction form
    92,978.21/128,307.23 = 52,695.69/x
  3. Step 3: Cross multiply
    92,978.21x = 128,307.23 × 52,695.69
  4. Step 4: Simplify right side
    92,978.21x = 6,761,238,339.75
  5. Step 5: Solve for x
    x = 6,761,238,339.75/92,978.21
  6. Step 6: Final answer
    x = 72,718.53

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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.