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Finding the Fourth Proportional to 1,574.48, 2,172.80 and 875.80

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Solution

The fourth proportional to 1,574.48, 2,172.80 and 875.80 is: 1,208.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,574.48 : 2,172.80 = 875.80 : x
  2. Step 2: Convert to fraction form
    1,574.48/2,172.80 = 875.80/x
  3. Step 3: Cross multiply
    1,574.48x = 2,172.80 × 875.80
  4. Step 4: Simplify right side
    1,574.48x = 1,902,938.24
  5. Step 5: Solve for x
    x = 1,902,938.24/1,574.48
  6. Step 6: Final answer
    x = 1,208.61

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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.