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Finding the Fourth Proportional to 210,782.55, 315,870.67 and 90,806.56

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Solution

The fourth proportional to 210,782.55, 315,870.67 and 90,806.56 is: 136,079.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,782.55 : 315,870.67 = 90,806.56 : x
  2. Step 2: Convert to fraction form
    210,782.55/315,870.67 = 90,806.56/x
  3. Step 3: Cross multiply
    210,782.55x = 315,870.67 × 90,806.56
  4. Step 4: Simplify right side
    210,782.55x = 28,683,128,947.60
  5. Step 5: Solve for x
    x = 28,683,128,947.60/210,782.55
  6. Step 6: Final answer
    x = 136,079.24

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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.