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Finding the Fourth Proportional to 520,065.80, 780,681.90 and 402,259.40

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Solution

The fourth proportional to 520,065.80, 780,681.90 and 402,259.40 is: 603,840.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,065.80 : 780,681.90 = 402,259.40 : x
  2. Step 2: Convert to fraction form
    520,065.80/780,681.90 = 402,259.40/x
  3. Step 3: Cross multiply
    520,065.80x = 780,681.90 × 402,259.40
  4. Step 4: Simplify right side
    520,065.80x = 314,036,632,684.86
  5. Step 5: Solve for x
    x = 314,036,632,684.86/520,065.80
  6. Step 6: Final answer
    x = 603,840.19

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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.