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Finding the Fourth Proportional to 390,055.70, 583,917.15 and 366,986.90

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Solution

The fourth proportional to 390,055.70, 583,917.15 and 366,986.90 is: 549,382.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,055.70 : 583,917.15 = 366,986.90 : x
  2. Step 2: Convert to fraction form
    390,055.70/583,917.15 = 366,986.90/x
  3. Step 3: Cross multiply
    390,055.70x = 583,917.15 × 366,986.90
  4. Step 4: Simplify right side
    390,055.70x = 214,289,944,735.34
  5. Step 5: Solve for x
    x = 214,289,944,735.34/390,055.70
  6. Step 6: Final answer
    x = 549,382.93

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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.