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Finding the Fourth Proportional to 708,600, 979,617.60 and 678,856.80

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Solution

The fourth proportional to 708,600, 979,617.60 and 678,856.80 is: 938,498.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,600 : 979,617.60 = 678,856.80 : x
  2. Step 2: Convert to fraction form
    708,600/979,617.60 = 678,856.80/x
  3. Step 3: Cross multiply
    708,600x = 979,617.60 × 678,856.80
  4. Step 4: Simplify right side
    708,600x = 665,020,069,159.68
  5. Step 5: Solve for x
    x = 665,020,069,159.68/708,600
  6. Step 6: Final answer
    x = 938,498.55

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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.