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Finding the Fourth Proportional to 973.76, 1,344.74 and 620.35

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Solution

The fourth proportional to 973.76, 1,344.74 and 620.35 is: 856.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    973.76 : 1,344.74 = 620.35 : x
  2. Step 2: Convert to fraction form
    973.76/1,344.74 = 620.35/x
  3. Step 3: Cross multiply
    973.76x = 1,344.74 × 620.35
  4. Step 4: Simplify right side
    973.76x = 834,209.46
  5. Step 5: Solve for x
    x = 834,209.46/973.76
  6. Step 6: Final answer
    x = 856.69

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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.