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Finding the Fourth Proportional to 426,989,801.20, 640,484,701.80 and 393,733,404.40

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Solution

The fourth proportional to 426,989,801.20, 640,484,701.80 and 393,733,404.40 is: 590,600,106.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,989,801.20 : 640,484,701.80 = 393,733,404.40 : x
  2. Step 2: Convert to fraction form
    426,989,801.20/640,484,701.80 = 393,733,404.40/x
  3. Step 3: Cross multiply
    426,989,801.20x = 640,484,701.80 × 393,733,404.40
  4. Step 4: Simplify right side
    426,989,801.20x = 252,180,222,105,832,768
  5. Step 5: Solve for x
    x = 252,180,222,105,832,768/426,989,801.20
  6. Step 6: Final answer
    x = 590,600,106.60

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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.