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Finding the Fourth Proportional to 642,494.80, 963,742.20 and 455,870.80

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Solution

The fourth proportional to 642,494.80, 963,742.20 and 455,870.80 is: 683,806.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,494.80 : 963,742.20 = 455,870.80 : x
  2. Step 2: Convert to fraction form
    642,494.80/963,742.20 = 455,870.80/x
  3. Step 3: Cross multiply
    642,494.80x = 963,742.20 × 455,870.80
  4. Step 4: Simplify right side
    642,494.80x = 439,341,927,707.76
  5. Step 5: Solve for x
    x = 439,341,927,707.76/642,494.80
  6. Step 6: Final answer
    x = 683,806.20

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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.