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Finding the Fourth Proportional to 628,612.48, 867,648.48 and 399,280

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Solution

The fourth proportional to 628,612.48, 867,648.48 and 399,280 is: 551,110.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,612.48 : 867,648.48 = 399,280 : x
  2. Step 2: Convert to fraction form
    628,612.48/867,648.48 = 399,280/x
  3. Step 3: Cross multiply
    628,612.48x = 867,648.48 × 399,280
  4. Step 4: Simplify right side
    628,612.48x = 346,434,685,094.40
  5. Step 5: Solve for x
    x = 346,434,685,094.40/628,612.48
  6. Step 6: Final answer
    x = 551,110.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.