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Finding the Fourth Proportional to 916.13, 1,263.95 and 543.22

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Solution

The fourth proportional to 916.13, 1,263.95 and 543.22 is: 749.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.13 : 1,263.95 = 543.22 : x
  2. Step 2: Convert to fraction form
    916.13/1,263.95 = 543.22/x
  3. Step 3: Cross multiply
    916.13x = 1,263.95 × 543.22
  4. Step 4: Simplify right side
    916.13x = 686,603.82
  5. Step 5: Solve for x
    x = 686,603.82/916.13
  6. Step 6: Final answer
    x = 749.47

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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.