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Finding the Fourth Proportional to 970.87, 1,339.92 and 577.88

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Solution

The fourth proportional to 970.87, 1,339.92 and 577.88 is: 797.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.87 : 1,339.92 = 577.88 : x
  2. Step 2: Convert to fraction form
    970.87/1,339.92 = 577.88/x
  3. Step 3: Cross multiply
    970.87x = 1,339.92 × 577.88
  4. Step 4: Simplify right side
    970.87x = 774,310.08
  5. Step 5: Solve for x
    x = 774,310.08/970.87
  6. Step 6: Final answer
    x = 797.55

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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.