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Finding the Fourth Proportional to 643,812.60, 965,718.90 and 312,036.60

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Solution

The fourth proportional to 643,812.60, 965,718.90 and 312,036.60 is: 468,054.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,812.60 : 965,718.90 = 312,036.60 : x
  2. Step 2: Convert to fraction form
    643,812.60/965,718.90 = 312,036.60/x
  3. Step 3: Cross multiply
    643,812.60x = 965,718.90 × 312,036.60
  4. Step 4: Simplify right side
    643,812.60x = 301,339,642,111.74
  5. Step 5: Solve for x
    x = 301,339,642,111.74/643,812.60
  6. Step 6: Final answer
    x = 468,054.90

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Similar ratio
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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.