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Finding the Fourth Proportional to 439,990.40, 659,985.60 and 260,364.80

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Solution

The fourth proportional to 439,990.40, 659,985.60 and 260,364.80 is: 390,547.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,990.40 : 659,985.60 = 260,364.80 : x
  2. Step 2: Convert to fraction form
    439,990.40/659,985.60 = 260,364.80/x
  3. Step 3: Cross multiply
    439,990.40x = 659,985.60 × 260,364.80
  4. Step 4: Simplify right side
    439,990.40x = 171,837,018,746.88
  5. Step 5: Solve for x
    x = 171,837,018,746.88/439,990.40
  6. Step 6: Final answer
    x = 390,547.20

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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.