Home / 1,420.16-2,127.15-688.19

Finding the Fourth Proportional to 1,420.16, 2,127.15 and 688.19

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Solution

The fourth proportional to 1,420.16, 2,127.15 and 688.19 is: 1,030.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.16 : 2,127.15 = 688.19 : x
  2. Step 2: Convert to fraction form
    1,420.16/2,127.15 = 688.19/x
  3. Step 3: Cross multiply
    1,420.16x = 2,127.15 × 688.19
  4. Step 4: Simplify right side
    1,420.16x = 1,463,888.68
  5. Step 5: Solve for x
    x = 1,463,888.68/1,420.16
  6. Step 6: Final answer
    x = 1,030.80

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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.