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Finding the Fourth Proportional to 685.35, 945.45 and 498.75

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Solution

The fourth proportional to 685.35, 945.45 and 498.75 is: 688.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.35 : 945.45 = 498.75 : x
  2. Step 2: Convert to fraction form
    685.35/945.45 = 498.75/x
  3. Step 3: Cross multiply
    685.35x = 945.45 × 498.75
  4. Step 4: Simplify right side
    685.35x = 471,543.19
  5. Step 5: Solve for x
    x = 471,543.19/685.35
  6. Step 6: Final answer
    x = 688.04

Related Problems

Find fourth proportional to 342.67, 472.73 and 249.38
Half scale
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Double scale
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Similar ratio
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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.