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Finding the Fourth Proportional to 990.74, 1,486.12 and 260.32

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Solution

The fourth proportional to 990.74, 1,486.12 and 260.32 is: 390.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.74 : 1,486.12 = 260.32 : x
  2. Step 2: Convert to fraction form
    990.74/1,486.12 = 260.32/x
  3. Step 3: Cross multiply
    990.74x = 1,486.12 × 260.32
  4. Step 4: Simplify right side
    990.74x = 386,866.76
  5. Step 5: Solve for x
    x = 386,866.76/990.74
  6. Step 6: Final answer
    x = 390.48

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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.