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Finding the Fourth Proportional to 61,421.90, 92,141.51 and 21,435.08

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Solution

The fourth proportional to 61,421.90, 92,141.51 and 21,435.08 is: 32,155.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,421.90 : 92,141.51 = 21,435.08 : x
  2. Step 2: Convert to fraction form
    61,421.90/92,141.51 = 21,435.08/x
  3. Step 3: Cross multiply
    61,421.90x = 92,141.51 × 21,435.08
  4. Step 4: Simplify right side
    61,421.90x = 1,975,060,070.29
  5. Step 5: Solve for x
    x = 1,975,060,070.29/61,421.90
  6. Step 6: Final answer
    x = 32,155.64

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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.