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Finding the Fourth Proportional to 108,774.61, 163,281.11 and 86,428.93

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Solution

The fourth proportional to 108,774.61, 163,281.11 and 86,428.93 is: 129,738.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,774.61 : 163,281.11 = 86,428.93 : x
  2. Step 2: Convert to fraction form
    108,774.61/163,281.11 = 86,428.93/x
  3. Step 3: Cross multiply
    108,774.61x = 163,281.11 × 86,428.93
  4. Step 4: Simplify right side
    108,774.61x = 14,112,211,626.51
  5. Step 5: Solve for x
    x = 14,112,211,626.51/108,774.61
  6. Step 6: Final answer
    x = 129,738.10

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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.