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Finding the Fourth Proportional to 856.55, 1,281.69 and 510.05

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Solution

The fourth proportional to 856.55, 1,281.69 and 510.05 is: 763.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.55 : 1,281.69 = 510.05 : x
  2. Step 2: Convert to fraction form
    856.55/1,281.69 = 510.05/x
  3. Step 3: Cross multiply
    856.55x = 1,281.69 × 510.05
  4. Step 4: Simplify right side
    856.55x = 653,719.58
  5. Step 5: Solve for x
    x = 653,719.58/856.55
  6. Step 6: Final answer
    x = 763.21

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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.