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Finding the Fourth Proportional to 553,140.40, 763,348.20 and 311,431.84

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Solution

The fourth proportional to 553,140.40, 763,348.20 and 311,431.84 is: 429,784.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    553,140.40 : 763,348.20 = 311,431.84 : x
  2. Step 2: Convert to fraction form
    553,140.40/763,348.20 = 311,431.84/x
  3. Step 3: Cross multiply
    553,140.40x = 763,348.20 × 311,431.84
  4. Step 4: Simplify right side
    553,140.40x = 237,730,934,486.69
  5. Step 5: Solve for x
    x = 237,730,934,486.69/553,140.40
  6. Step 6: Final answer
    x = 429,784.07

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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.