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Finding the Fourth Proportional to 983.90, 1,357.96 and 590.95

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Solution

The fourth proportional to 983.90, 1,357.96 and 590.95 is: 815.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.90 : 1,357.96 = 590.95 : x
  2. Step 2: Convert to fraction form
    983.90/1,357.96 = 590.95/x
  3. Step 3: Cross multiply
    983.90x = 1,357.96 × 590.95
  4. Step 4: Simplify right side
    983.90x = 802,492.55
  5. Step 5: Solve for x
    x = 802,492.55/983.90
  6. Step 6: Final answer
    x = 815.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.