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Finding the Fourth Proportional to 970.89, 1,339.81 and 577.90

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Solution

The fourth proportional to 970.89, 1,339.81 and 577.90 is: 797.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.89 : 1,339.81 = 577.90 : x
  2. Step 2: Convert to fraction form
    970.89/1,339.81 = 577.90/x
  3. Step 3: Cross multiply
    970.89x = 1,339.81 × 577.90
  4. Step 4: Simplify right side
    970.89x = 774,276.20
  5. Step 5: Solve for x
    x = 774,276.20/970.89
  6. Step 6: Final answer
    x = 797.49

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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.