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Finding the Fourth Proportional to 560,014.91, 840,020.78 and 139,290.79

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Solution

The fourth proportional to 560,014.91, 840,020.78 and 139,290.79 is: 208,935.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    560,014.91 : 840,020.78 = 139,290.79 : x
  2. Step 2: Convert to fraction form
    560,014.91/840,020.78 = 139,290.79/x
  3. Step 3: Cross multiply
    560,014.91x = 840,020.78 × 139,290.79
  4. Step 4: Simplify right side
    560,014.91x = 117,007,157,102.32
  5. Step 5: Solve for x
    x = 117,007,157,102.32/560,014.91
  6. Step 6: Final answer
    x = 208,935.79

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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.