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Finding the Fourth Proportional to 830.47, 1,145.38 and 706.54

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Solution

The fourth proportional to 830.47, 1,145.38 and 706.54 is: 974.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.47 : 1,145.38 = 706.54 : x
  2. Step 2: Convert to fraction form
    830.47/1,145.38 = 706.54/x
  3. Step 3: Cross multiply
    830.47x = 1,145.38 × 706.54
  4. Step 4: Simplify right side
    830.47x = 809,256.79
  5. Step 5: Solve for x
    x = 809,256.79/830.47
  6. Step 6: Final answer
    x = 974.46

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Double scale
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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.