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Finding the Fourth Proportional to 1,851.10, 2,776.65 and 987.10

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Solution

The fourth proportional to 1,851.10, 2,776.65 and 987.10 is: 1,480.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,851.10 : 2,776.65 = 987.10 : x
  2. Step 2: Convert to fraction form
    1,851.10/2,776.65 = 987.10/x
  3. Step 3: Cross multiply
    1,851.10x = 2,776.65 × 987.10
  4. Step 4: Simplify right side
    1,851.10x = 2,740,831.22
  5. Step 5: Solve for x
    x = 2,740,831.22/1,851.10
  6. Step 6: Final answer
    x = 1,480.65

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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.