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Finding the Fourth Proportional to 426,520,875.30, 639,781,312.95 and 426,520,875.30

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Solution

The fourth proportional to 426,520,875.30, 639,781,312.95 and 426,520,875.30 is: 639,781,312.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,520,875.30 : 639,781,312.95 = 426,520,875.30 : x
  2. Step 2: Convert to fraction form
    426,520,875.30/639,781,312.95 = 426,520,875.30/x
  3. Step 3: Cross multiply
    426,520,875.30x = 639,781,312.95 × 426,520,875.30
  4. Step 4: Simplify right side
    426,520,875.30x = 272,880,085,600,017,248
  5. Step 5: Solve for x
    x = 272,880,085,600,017,248/426,520,875.30
  6. Step 6: Final answer
    x = 639,781,312.95

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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.