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Finding the Fourth Proportional to 518,651.20, 715,045.44 and 389,038.72

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Solution

The fourth proportional to 518,651.20, 715,045.44 and 389,038.72 is: 536,353.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,651.20 : 715,045.44 = 389,038.72 : x
  2. Step 2: Convert to fraction form
    518,651.20/715,045.44 = 389,038.72/x
  3. Step 3: Cross multiply
    518,651.20x = 715,045.44 × 389,038.72
  4. Step 4: Simplify right side
    518,651.20x = 278,180,362,719.44
  5. Step 5: Solve for x
    x = 278,180,362,719.44/518,651.20
  6. Step 6: Final answer
    x = 536,353.45

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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.