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Finding the Fourth Proportional to 660,219.40, 990,329.10 and 305,925.40

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Solution

The fourth proportional to 660,219.40, 990,329.10 and 305,925.40 is: 458,888.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,219.40 : 990,329.10 = 305,925.40 : x
  2. Step 2: Convert to fraction form
    660,219.40/990,329.10 = 305,925.40/x
  3. Step 3: Cross multiply
    660,219.40x = 990,329.10 × 305,925.40
  4. Step 4: Simplify right side
    660,219.40x = 302,966,826,049.14
  5. Step 5: Solve for x
    x = 302,966,826,049.14/660,219.40
  6. Step 6: Final answer
    x = 458,888.10

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Double scale
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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.