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Finding the Fourth Proportional to 339,779.32, 509,688.42 and 103,129.72

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Solution

The fourth proportional to 339,779.32, 509,688.42 and 103,129.72 is: 154,700.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,779.32 : 509,688.42 = 103,129.72 : x
  2. Step 2: Convert to fraction form
    339,779.32/509,688.42 = 103,129.72/x
  3. Step 3: Cross multiply
    339,779.32x = 509,688.42 × 103,129.72
  4. Step 4: Simplify right side
    339,779.32x = 52,564,024,041.84
  5. Step 5: Solve for x
    x = 52,564,024,041.84/339,779.32
  6. Step 6: Final answer
    x = 154,700.48

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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.