Home / 430,421.60-645,632.40-388,949.60

Finding the Fourth Proportional to 430,421.60, 645,632.40 and 388,949.60

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Solution

The fourth proportional to 430,421.60, 645,632.40 and 388,949.60 is: 583,424.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,421.60 : 645,632.40 = 388,949.60 : x
  2. Step 2: Convert to fraction form
    430,421.60/645,632.40 = 388,949.60/x
  3. Step 3: Cross multiply
    430,421.60x = 645,632.40 × 388,949.60
  4. Step 4: Simplify right side
    430,421.60x = 251,118,463,727.04
  5. Step 5: Solve for x
    x = 251,118,463,727.04/430,421.60
  6. Step 6: Final answer
    x = 583,424.40

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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.