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Finding the Fourth Proportional to 387,064.40, 579,430.20 and 340,408.40

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Solution

The fourth proportional to 387,064.40, 579,430.20 and 340,408.40 is: 509,586.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,064.40 : 579,430.20 = 340,408.40 : x
  2. Step 2: Convert to fraction form
    387,064.40/579,430.20 = 340,408.40/x
  3. Step 3: Cross multiply
    387,064.40x = 579,430.20 × 340,408.40
  4. Step 4: Simplify right side
    387,064.40x = 197,242,907,293.68
  5. Step 5: Solve for x
    x = 197,242,907,293.68/387,064.40
  6. Step 6: Final answer
    x = 509,586.80

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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.