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Finding the Fourth Proportional to 3,210.79, 4,816.49 and 870.82

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Solution

The fourth proportional to 3,210.79, 4,816.49 and 870.82 is: 1,306.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,210.79 : 4,816.49 = 870.82 : x
  2. Step 2: Convert to fraction form
    3,210.79/4,816.49 = 870.82/x
  3. Step 3: Cross multiply
    3,210.79x = 4,816.49 × 870.82
  4. Step 4: Simplify right side
    3,210.79x = 4,194,303.51
  5. Step 5: Solve for x
    x = 4,194,303.51/3,210.79
  6. Step 6: Final answer
    x = 1,306.32

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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.