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Finding the Fourth Proportional to 830.26, 1,145.67 and 498.68

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Solution

The fourth proportional to 830.26, 1,145.67 and 498.68 is: 688.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.26 : 1,145.67 = 498.68 : x
  2. Step 2: Convert to fraction form
    830.26/1,145.67 = 498.68/x
  3. Step 3: Cross multiply
    830.26x = 1,145.67 × 498.68
  4. Step 4: Simplify right side
    830.26x = 571,322.72
  5. Step 5: Solve for x
    x = 571,322.72/830.26
  6. Step 6: Final answer
    x = 688.13

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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.