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Finding the Fourth Proportional to 489,720.40, 734,580.60 and 340,421.20

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Solution

The fourth proportional to 489,720.40, 734,580.60 and 340,421.20 is: 510,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,720.40 : 734,580.60 = 340,421.20 : x
  2. Step 2: Convert to fraction form
    489,720.40/734,580.60 = 340,421.20/x
  3. Step 3: Cross multiply
    489,720.40x = 734,580.60 × 340,421.20
  4. Step 4: Simplify right side
    489,720.40x = 250,066,809,348.72
  5. Step 5: Solve for x
    x = 250,066,809,348.72/489,720.40
  6. Step 6: Final answer
    x = 510,631.80

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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.