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Finding the Fourth Proportional to 139,031.60, 208,547.40 and 69,047.60

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Solution

The fourth proportional to 139,031.60, 208,547.40 and 69,047.60 is: 103,571.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,031.60 : 208,547.40 = 69,047.60 : x
  2. Step 2: Convert to fraction form
    139,031.60/208,547.40 = 69,047.60/x
  3. Step 3: Cross multiply
    139,031.60x = 208,547.40 × 69,047.60
  4. Step 4: Simplify right side
    139,031.60x = 14,399,697,456.24
  5. Step 5: Solve for x
    x = 14,399,697,456.24/139,031.60
  6. Step 6: Final answer
    x = 103,571.40

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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.