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Finding the Fourth Proportional to 611,861.90, 917,792.85 and 521,320.10

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Solution

The fourth proportional to 611,861.90, 917,792.85 and 521,320.10 is: 781,980.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,861.90 : 917,792.85 = 521,320.10 : x
  2. Step 2: Convert to fraction form
    611,861.90/917,792.85 = 521,320.10/x
  3. Step 3: Cross multiply
    611,861.90x = 917,792.85 × 521,320.10
  4. Step 4: Simplify right side
    611,861.90x = 478,463,860,341.29
  5. Step 5: Solve for x
    x = 478,463,860,341.29/611,861.90
  6. Step 6: Final answer
    x = 781,980.15

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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.