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Finding the Fourth Proportional to 662,117.54, 913,647.77 and 390,167.78

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Solution

The fourth proportional to 662,117.54, 913,647.77 and 390,167.78 is: 538,387.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,117.54 : 913,647.77 = 390,167.78 : x
  2. Step 2: Convert to fraction form
    662,117.54/913,647.77 = 390,167.78/x
  3. Step 3: Cross multiply
    662,117.54x = 913,647.77 × 390,167.78
  4. Step 4: Simplify right side
    662,117.54x = 356,475,922,122.85
  5. Step 5: Solve for x
    x = 356,475,922,122.85/662,117.54
  6. Step 6: Final answer
    x = 538,387.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.