Home / 2,931.80-4,045.20-1,938.68

Finding the Fourth Proportional to 2,931.80, 4,045.20 and 1,938.68

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Solution

The fourth proportional to 2,931.80, 4,045.20 and 1,938.68 is: 2,674.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,931.80 : 4,045.20 = 1,938.68 : x
  2. Step 2: Convert to fraction form
    2,931.80/4,045.20 = 1,938.68/x
  3. Step 3: Cross multiply
    2,931.80x = 4,045.20 × 1,938.68
  4. Step 4: Simplify right side
    2,931.80x = 7,842,348.34
  5. Step 5: Solve for x
    x = 7,842,348.34/2,931.80
  6. Step 6: Final answer
    x = 2,674.93

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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.