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Finding the Fourth Proportional to 651,278.80, 976,918.20 and 385,339.60

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Solution

The fourth proportional to 651,278.80, 976,918.20 and 385,339.60 is: 578,009.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,278.80 : 976,918.20 = 385,339.60 : x
  2. Step 2: Convert to fraction form
    651,278.80/976,918.20 = 385,339.60/x
  3. Step 3: Cross multiply
    651,278.80x = 976,918.20 × 385,339.60
  4. Step 4: Simplify right side
    651,278.80x = 376,445,268,420.72
  5. Step 5: Solve for x
    x = 376,445,268,420.72/651,278.80
  6. Step 6: Final answer
    x = 578,009.40

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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.