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Finding the Fourth Proportional to 318,856.40, 478,111.80 and 131,656.40

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Solution

The fourth proportional to 318,856.40, 478,111.80 and 131,656.40 is: 197,413.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,856.40 : 478,111.80 = 131,656.40 : x
  2. Step 2: Convert to fraction form
    318,856.40/478,111.80 = 131,656.40/x
  3. Step 3: Cross multiply
    318,856.40x = 478,111.80 × 131,656.40
  4. Step 4: Simplify right side
    318,856.40x = 62,946,478,385.52
  5. Step 5: Solve for x
    x = 62,946,478,385.52/318,856.40
  6. Step 6: Final answer
    x = 197,413.25

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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.