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Finding the Fourth Proportional to 1,918.30, 2,875.69 and 619.10

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Solution

The fourth proportional to 1,918.30, 2,875.69 and 619.10 is: 928.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.30 : 2,875.69 = 619.10 : x
  2. Step 2: Convert to fraction form
    1,918.30/2,875.69 = 619.10/x
  3. Step 3: Cross multiply
    1,918.30x = 2,875.69 × 619.10
  4. Step 4: Simplify right side
    1,918.30x = 1,780,339.68
  5. Step 5: Solve for x
    x = 1,780,339.68/1,918.30
  6. Step 6: Final answer
    x = 928.08

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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.