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Finding the Fourth Proportional to 870.83, 1,303.68 and 762.83

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Solution

The fourth proportional to 870.83, 1,303.68 and 762.83 is: 1,142.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.83 : 1,303.68 = 762.83 : x
  2. Step 2: Convert to fraction form
    870.83/1,303.68 = 762.83/x
  3. Step 3: Cross multiply
    870.83x = 1,303.68 × 762.83
  4. Step 4: Simplify right side
    870.83x = 994,486.21
  5. Step 5: Solve for x
    x = 994,486.21/870.83
  6. Step 6: Final answer
    x = 1,142.00

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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.