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Finding the Fourth Proportional to 870.48, 1,303.98 and 407.62

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Solution

The fourth proportional to 870.48, 1,303.98 and 407.62 is: 610.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.48 : 1,303.98 = 407.62 : x
  2. Step 2: Convert to fraction form
    870.48/1,303.98 = 407.62/x
  3. Step 3: Cross multiply
    870.48x = 1,303.98 × 407.62
  4. Step 4: Simplify right side
    870.48x = 531,528.33
  5. Step 5: Solve for x
    x = 531,528.33/870.48
  6. Step 6: Final answer
    x = 610.62

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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.