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Finding the Fourth Proportional to 930.90, 1,285.72 and 734.16

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Solution

The fourth proportional to 930.90, 1,285.72 and 734.16 is: 1,013.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.90 : 1,285.72 = 734.16 : x
  2. Step 2: Convert to fraction form
    930.90/1,285.72 = 734.16/x
  3. Step 3: Cross multiply
    930.90x = 1,285.72 × 734.16
  4. Step 4: Simplify right side
    930.90x = 943,924.20
  5. Step 5: Solve for x
    x = 943,924.20/930.90
  6. Step 6: Final answer
    x = 1,013.99

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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.