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Finding the Fourth Proportional to 85,866.17, 128,878.52 and 61,875.38

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Solution

The fourth proportional to 85,866.17, 128,878.52 and 61,875.38 is: 92,870.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,866.17 : 128,878.52 = 61,875.38 : x
  2. Step 2: Convert to fraction form
    85,866.17/128,878.52 = 61,875.38/x
  3. Step 3: Cross multiply
    85,866.17x = 128,878.52 × 61,875.38
  4. Step 4: Simplify right side
    85,866.17x = 7,974,406,445.07
  5. Step 5: Solve for x
    x = 7,974,406,445.07/85,866.17
  6. Step 6: Final answer
    x = 92,870.18

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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.