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Finding the Fourth Proportional to 970.58, 1,339.65 and 621.88

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Solution

The fourth proportional to 970.58, 1,339.65 and 621.88 is: 858.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.58 : 1,339.65 = 621.88 : x
  2. Step 2: Convert to fraction form
    970.58/1,339.65 = 621.88/x
  3. Step 3: Cross multiply
    970.58x = 1,339.65 × 621.88
  4. Step 4: Simplify right side
    970.58x = 833,098.19
  5. Step 5: Solve for x
    x = 833,098.19/970.58
  6. Step 6: Final answer
    x = 858.35

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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.