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Finding the Fourth Proportional to 261,169, 391,788.35 and 103,360.55

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Solution

The fourth proportional to 261,169, 391,788.35 and 103,360.55 is: 155,054.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,169 : 391,788.35 = 103,360.55 : x
  2. Step 2: Convert to fraction form
    261,169/391,788.35 = 103,360.55/x
  3. Step 3: Cross multiply
    261,169x = 391,788.35 × 103,360.55
  4. Step 4: Simplify right side
    261,169x = 40,495,459,339.59
  5. Step 5: Solve for x
    x = 40,495,459,339.59/261,169
  6. Step 6: Final answer
    x = 155,054.62

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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.