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Finding the Fourth Proportional to 5,319.20, 7,978.64 and 1,856.40

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Solution

The fourth proportional to 5,319.20, 7,978.64 and 1,856.40 is: 2,784.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.20 : 7,978.64 = 1,856.40 : x
  2. Step 2: Convert to fraction form
    5,319.20/7,978.64 = 1,856.40/x
  3. Step 3: Cross multiply
    5,319.20x = 7,978.64 × 1,856.40
  4. Step 4: Simplify right side
    5,319.20x = 14,811,547.30
  5. Step 5: Solve for x
    x = 14,811,547.30/5,319.20
  6. Step 6: Final answer
    x = 2,784.54

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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.