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Finding the Fourth Proportional to 145,012.78, 217,510.43 and 86,222.58

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Solution

The fourth proportional to 145,012.78, 217,510.43 and 86,222.58 is: 129,328.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,012.78 : 217,510.43 = 86,222.58 : x
  2. Step 2: Convert to fraction form
    145,012.78/217,510.43 = 86,222.58/x
  3. Step 3: Cross multiply
    145,012.78x = 217,510.43 × 86,222.58
  4. Step 4: Simplify right side
    145,012.78x = 18,754,309,689.73
  5. Step 5: Solve for x
    x = 18,754,309,689.73/145,012.78
  6. Step 6: Final answer
    x = 129,328.67

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1.5x scale

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.