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Finding the Fourth Proportional to 76,428, 105,471.36 and 42,894.72

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Solution

The fourth proportional to 76,428, 105,471.36 and 42,894.72 is: 59,195.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,428 : 105,471.36 = 42,894.72 : x
  2. Step 2: Convert to fraction form
    76,428/105,471.36 = 42,894.72/x
  3. Step 3: Cross multiply
    76,428x = 105,471.36 × 42,894.72
  4. Step 4: Simplify right side
    76,428x = 4,524,164,455.22
  5. Step 5: Solve for x
    x = 4,524,164,455.22/76,428
  6. Step 6: Final answer
    x = 59,195.12

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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.