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Finding the Fourth Proportional to 561,038.40, 774,220.68 and 306,390.60

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Solution

The fourth proportional to 561,038.40, 774,220.68 and 306,390.60 is: 422,812.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    561,038.40 : 774,220.68 = 306,390.60 : x
  2. Step 2: Convert to fraction form
    561,038.40/774,220.68 = 306,390.60/x
  3. Step 3: Cross multiply
    561,038.40x = 774,220.68 × 306,390.60
  4. Step 4: Simplify right side
    561,038.40x = 237,213,938,677.61
  5. Step 5: Solve for x
    x = 237,213,938,677.61/561,038.40
  6. Step 6: Final answer
    x = 422,812.30

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.