Home / 811,426.86-1,217,840.13-313,140.78

Finding the Fourth Proportional to 811,426.86, 1,217,840.13 and 313,140.78

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Solution

The fourth proportional to 811,426.86, 1,217,840.13 and 313,140.78 is: 469,981.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,426.86 : 1,217,840.13 = 313,140.78 : x
  2. Step 2: Convert to fraction form
    811,426.86/1,217,840.13 = 313,140.78/x
  3. Step 3: Cross multiply
    811,426.86x = 1,217,840.13 × 313,140.78
  4. Step 4: Simplify right side
    811,426.86x = 381,355,408,223.50
  5. Step 5: Solve for x
    x = 381,355,408,223.50/811,426.86
  6. Step 6: Final answer
    x = 469,981.25

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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.