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Finding the Fourth Proportional to 970.12, 1,338.46 and 655.74

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Solution

The fourth proportional to 970.12, 1,338.46 and 655.74 is: 904.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.12 : 1,338.46 = 655.74 : x
  2. Step 2: Convert to fraction form
    970.12/1,338.46 = 655.74/x
  3. Step 3: Cross multiply
    970.12x = 1,338.46 × 655.74
  4. Step 4: Simplify right side
    970.12x = 877,681.76
  5. Step 5: Solve for x
    x = 877,681.76/970.12
  6. Step 6: Final answer
    x = 904.71

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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.