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Finding the Fourth Proportional to 990.95, 1,486.42 and 260.51

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Solution

The fourth proportional to 990.95, 1,486.42 and 260.51 is: 390.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.95 : 1,486.42 = 260.51 : x
  2. Step 2: Convert to fraction form
    990.95/1,486.42 = 260.51/x
  3. Step 3: Cross multiply
    990.95x = 1,486.42 × 260.51
  4. Step 4: Simplify right side
    990.95x = 387,219.19
  5. Step 5: Solve for x
    x = 387,219.19/990.95
  6. Step 6: Final answer
    x = 390.76

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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.