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Finding the Fourth Proportional to 970.47, 1,339.61 and 622.17

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Solution

The fourth proportional to 970.47, 1,339.61 and 622.17 is: 858.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.47 : 1,339.61 = 622.17 : x
  2. Step 2: Convert to fraction form
    970.47/1,339.61 = 622.17/x
  3. Step 3: Cross multiply
    970.47x = 1,339.61 × 622.17
  4. Step 4: Simplify right side
    970.47x = 833,462.04
  5. Step 5: Solve for x
    x = 833,462.04/970.47
  6. Step 6: Final answer
    x = 858.82

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1.5x scale

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.