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Finding the Fourth Proportional to 913.08, 1,259.60 and 647.58

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Solution

The fourth proportional to 913.08, 1,259.60 and 647.58 is: 893.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.08 : 1,259.60 = 647.58 : x
  2. Step 2: Convert to fraction form
    913.08/1,259.60 = 647.58/x
  3. Step 3: Cross multiply
    913.08x = 1,259.60 × 647.58
  4. Step 4: Simplify right side
    913.08x = 815,691.77
  5. Step 5: Solve for x
    x = 815,691.77/913.08
  6. Step 6: Final answer
    x = 893.34

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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.