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Finding the Fourth Proportional to 153,707.61, 212,116.11 and 85,724.67

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Solution

The fourth proportional to 153,707.61, 212,116.11 and 85,724.67 is: 118,299.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,707.61 : 212,116.11 = 85,724.67 : x
  2. Step 2: Convert to fraction form
    153,707.61/212,116.11 = 85,724.67/x
  3. Step 3: Cross multiply
    153,707.61x = 212,116.11 × 85,724.67
  4. Step 4: Simplify right side
    153,707.61x = 18,183,583,531.43
  5. Step 5: Solve for x
    x = 18,183,583,531.43/153,707.61
  6. Step 6: Final answer
    x = 118,299.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.