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Finding the Fourth Proportional to 990.88, 1,486.40 and 260.45

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Solution

The fourth proportional to 990.88, 1,486.40 and 260.45 is: 390.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.88 : 1,486.40 = 260.45 : x
  2. Step 2: Convert to fraction form
    990.88/1,486.40 = 260.45/x
  3. Step 3: Cross multiply
    990.88x = 1,486.40 × 260.45
  4. Step 4: Simplify right side
    990.88x = 387,132.88
  5. Step 5: Solve for x
    x = 387,132.88/990.88
  6. Step 6: Final answer
    x = 390.70

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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.