Home / 2,130.81-2,938.86-1,385.02

Finding the Fourth Proportional to 2,130.81, 2,938.86 and 1,385.02

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Solution

The fourth proportional to 2,130.81, 2,938.86 and 1,385.02 is: 1,910.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,130.81 : 2,938.86 = 1,385.02 : x
  2. Step 2: Convert to fraction form
    2,130.81/2,938.86 = 1,385.02/x
  3. Step 3: Cross multiply
    2,130.81x = 2,938.86 × 1,385.02
  4. Step 4: Simplify right side
    2,130.81x = 4,070,387.92
  5. Step 5: Solve for x
    x = 4,070,387.92/2,130.81
  6. Step 6: Final answer
    x = 1,910.26

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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.