Home / 1,370.01-1,890.16-780.13

Finding the Fourth Proportional to 1,370.01, 1,890.16 and 780.13

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Solution

The fourth proportional to 1,370.01, 1,890.16 and 780.13 is: 1,076.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.01 : 1,890.16 = 780.13 : x
  2. Step 2: Convert to fraction form
    1,370.01/1,890.16 = 780.13/x
  3. Step 3: Cross multiply
    1,370.01x = 1,890.16 × 780.13
  4. Step 4: Simplify right side
    1,370.01x = 1,474,566.62
  5. Step 5: Solve for x
    x = 1,474,566.62/1,370.01
  6. Step 6: Final answer
    x = 1,076.32

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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.