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Finding the Fourth Proportional to 810.95, 1,215.28 and 463.76

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Solution

The fourth proportional to 810.95, 1,215.28 and 463.76 is: 694.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.95 : 1,215.28 = 463.76 : x
  2. Step 2: Convert to fraction form
    810.95/1,215.28 = 463.76/x
  3. Step 3: Cross multiply
    810.95x = 1,215.28 × 463.76
  4. Step 4: Simplify right side
    810.95x = 563,605.45
  5. Step 5: Solve for x
    x = 563,605.45/810.95
  6. Step 6: Final answer
    x = 694.99

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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.