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Finding the Fourth Proportional to 620,643.80, 930,965.70 and 578,653.40

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Solution

The fourth proportional to 620,643.80, 930,965.70 and 578,653.40 is: 867,980.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,643.80 : 930,965.70 = 578,653.40 : x
  2. Step 2: Convert to fraction form
    620,643.80/930,965.70 = 578,653.40/x
  3. Step 3: Cross multiply
    620,643.80x = 930,965.70 × 578,653.40
  4. Step 4: Simplify right side
    620,643.80x = 538,706,467,588.38
  5. Step 5: Solve for x
    x = 538,706,467,588.38/620,643.80
  6. Step 6: Final answer
    x = 867,980.10

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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.