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Finding the Fourth Proportional to 1,020.32, 1,530.53 and 442.79

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Solution

The fourth proportional to 1,020.32, 1,530.53 and 442.79 is: 664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.32 : 1,530.53 = 442.79 : x
  2. Step 2: Convert to fraction form
    1,020.32/1,530.53 = 442.79/x
  3. Step 3: Cross multiply
    1,020.32x = 1,530.53 × 442.79
  4. Step 4: Simplify right side
    1,020.32x = 677,693.51
  5. Step 5: Solve for x
    x = 677,693.51/1,020.32
  6. Step 6: Final answer
    x = 664.20

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Double scale
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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.