Home / 810,828.70-1,216,243.05-390,147.10

Finding the Fourth Proportional to 810,828.70, 1,216,243.05 and 390,147.10

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Solution

The fourth proportional to 810,828.70, 1,216,243.05 and 390,147.10 is: 585,220.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    810,828.70 : 1,216,243.05 = 390,147.10 : x
  2. Step 2: Convert to fraction form
    810,828.70/1,216,243.05 = 390,147.10/x
  3. Step 3: Cross multiply
    810,828.70x = 1,216,243.05 × 390,147.10
  4. Step 4: Simplify right side
    810,828.70x = 474,513,698,852.66
  5. Step 5: Solve for x
    x = 474,513,698,852.66/810,828.70
  6. Step 6: Final answer
    x = 585,220.65

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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.