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Finding the Fourth Proportional to 985.58, 1,478.71 and 438.14

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Solution

The fourth proportional to 985.58, 1,478.71 and 438.14 is: 657.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.58 : 1,478.71 = 438.14 : x
  2. Step 2: Convert to fraction form
    985.58/1,478.71 = 438.14/x
  3. Step 3: Cross multiply
    985.58x = 1,478.71 × 438.14
  4. Step 4: Simplify right side
    985.58x = 647,883.51
  5. Step 5: Solve for x
    x = 647,883.51/985.58
  6. Step 6: Final answer
    x = 657.36

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.