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Finding the Fourth Proportional to 390,718.56, 586,089.99 and 134,548.50

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Solution

The fourth proportional to 390,718.56, 586,089.99 and 134,548.50 is: 201,826.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,718.56 : 586,089.99 = 134,548.50 : x
  2. Step 2: Convert to fraction form
    390,718.56/586,089.99 = 134,548.50/x
  3. Step 3: Cross multiply
    390,718.56x = 586,089.99 × 134,548.50
  4. Step 4: Simplify right side
    390,718.56x = 78,857,529,019.52
  5. Step 5: Solve for x
    x = 78,857,529,019.52/390,718.56
  6. Step 6: Final answer
    x = 201,826.93

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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.