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Finding the Fourth Proportional to 143,658.15, 215,413.40 and 77,154.21

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Solution

The fourth proportional to 143,658.15, 215,413.40 and 77,154.21 is: 115,691.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,658.15 : 215,413.40 = 77,154.21 : x
  2. Step 2: Convert to fraction form
    143,658.15/215,413.40 = 77,154.21/x
  3. Step 3: Cross multiply
    143,658.15x = 215,413.40 × 77,154.21
  4. Step 4: Simplify right side
    143,658.15x = 16,620,050,893.30
  5. Step 5: Solve for x
    x = 16,620,050,893.30/143,658.15
  6. Step 6: Final answer
    x = 115,691.67

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1.5x scale

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.