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Finding the Fourth Proportional to 409,969.40, 614,954.10 and 339,985.40

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Solution

The fourth proportional to 409,969.40, 614,954.10 and 339,985.40 is: 509,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,969.40 : 614,954.10 = 339,985.40 : x
  2. Step 2: Convert to fraction form
    409,969.40/614,954.10 = 339,985.40/x
  3. Step 3: Cross multiply
    409,969.40x = 614,954.10 × 339,985.40
  4. Step 4: Simplify right side
    409,969.40x = 209,075,415,670.14
  5. Step 5: Solve for x
    x = 209,075,415,670.14/409,969.40
  6. Step 6: Final answer
    x = 509,978.10

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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.