Home / 1,420.22-2,127.18-870.74

Finding the Fourth Proportional to 1,420.22, 2,127.18 and 870.74

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Solution

The fourth proportional to 1,420.22, 2,127.18 and 870.74 is: 1,304.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.22 : 2,127.18 = 870.74 : x
  2. Step 2: Convert to fraction form
    1,420.22/2,127.18 = 870.74/x
  3. Step 3: Cross multiply
    1,420.22x = 2,127.18 × 870.74
  4. Step 4: Simplify right side
    1,420.22x = 1,852,210.08
  5. Step 5: Solve for x
    x = 1,852,210.08/1,420.22
  6. Step 6: Final answer
    x = 1,304.18

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1.5x scale

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.