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Finding the Fourth Proportional to 259,300.50, 389,016.45 and 72,312

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Solution

The fourth proportional to 259,300.50, 389,016.45 and 72,312 is: 108,486.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,300.50 : 389,016.45 = 72,312 : x
  2. Step 2: Convert to fraction form
    259,300.50/389,016.45 = 72,312/x
  3. Step 3: Cross multiply
    259,300.50x = 389,016.45 × 72,312
  4. Step 4: Simplify right side
    259,300.50x = 28,130,557,532.40
  5. Step 5: Solve for x
    x = 28,130,557,532.40/259,300.50
  6. Step 6: Final answer
    x = 108,486.32

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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.