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Finding the Fourth Proportional to 338,430.80, 507,646.20 and 128,075.60

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Solution

The fourth proportional to 338,430.80, 507,646.20 and 128,075.60 is: 192,113.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,430.80 : 507,646.20 = 128,075.60 : x
  2. Step 2: Convert to fraction form
    338,430.80/507,646.20 = 128,075.60/x
  3. Step 3: Cross multiply
    338,430.80x = 507,646.20 × 128,075.60
  4. Step 4: Simplify right side
    338,430.80x = 65,017,091,652.72
  5. Step 5: Solve for x
    x = 65,017,091,652.72/338,430.80
  6. Step 6: Final answer
    x = 192,113.40

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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.