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Finding the Fourth Proportional to 39,985.40, 59,978.18 and 10,403.19

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Solution

The fourth proportional to 39,985.40, 59,978.18 and 10,403.19 is: 15,604.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,985.40 : 59,978.18 = 10,403.19 : x
  2. Step 2: Convert to fraction form
    39,985.40/59,978.18 = 10,403.19/x
  3. Step 3: Cross multiply
    39,985.40x = 59,978.18 × 10,403.19
  4. Step 4: Simplify right side
    39,985.40x = 623,964,050.49
  5. Step 5: Solve for x
    x = 623,964,050.49/39,985.40
  6. Step 6: Final answer
    x = 15,604.80

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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.