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Finding the Fourth Proportional to 913.70, 1,260.63 and 647.93

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Solution

The fourth proportional to 913.70, 1,260.63 and 647.93 is: 893.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.70 : 1,260.63 = 647.93 : x
  2. Step 2: Convert to fraction form
    913.70/1,260.63 = 647.93/x
  3. Step 3: Cross multiply
    913.70x = 1,260.63 × 647.93
  4. Step 4: Simplify right side
    913.70x = 816,803.15
  5. Step 5: Solve for x
    x = 816,803.15/913.70
  6. Step 6: Final answer
    x = 893.95

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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.