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Finding the Fourth Proportional to 56,688.30, 84,978.45 and 21,140.10

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Solution

The fourth proportional to 56,688.30, 84,978.45 and 21,140.10 is: 31,690.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,688.30 : 84,978.45 = 21,140.10 : x
  2. Step 2: Convert to fraction form
    56,688.30/84,978.45 = 21,140.10/x
  3. Step 3: Cross multiply
    56,688.30x = 84,978.45 × 21,140.10
  4. Step 4: Simplify right side
    56,688.30x = 1,796,452,930.85
  5. Step 5: Solve for x
    x = 1,796,452,930.85/56,688.30
  6. Step 6: Final answer
    x = 31,690.01

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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.