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Finding the Fourth Proportional to 1,486.55, 2,231.55 and 870.71

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Solution

The fourth proportional to 1,486.55, 2,231.55 and 870.71 is: 1,307.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.55 : 2,231.55 = 870.71 : x
  2. Step 2: Convert to fraction form
    1,486.55/2,231.55 = 870.71/x
  3. Step 3: Cross multiply
    1,486.55x = 2,231.55 × 870.71
  4. Step 4: Simplify right side
    1,486.55x = 1,943,021.74
  5. Step 5: Solve for x
    x = 1,943,021.74/1,486.55
  6. Step 6: Final answer
    x = 1,307.07

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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.